New, unlocked from Apple, they are $649 + tax, so around $733 all in. If it is locked to a carrier, I would guess between $400 and $550, depending on which carrier. Being a lower volume carrier like Fido could go both ways. Not as many potential customers, so resale price might be on the low end but then there won't be as many available for sale either, which would raise the possible price. I searched on kijiji quickly and saw Fido 4S listed for between $510 and $550.